Utilizing exhaust



(No Model.) D. RBNSHAW.

UTILIZING EXHAUST.

No. 290.473. Patented Dec. 18, 1 83.

WITNESSES a I EJVZO NITED S'rarns DAVID RENSHAW, OF BRAINTREE, MASSACHUSETTS.

UTlLlZlNG EXHAUST.

SPECIFICATION forming part of Letters Patent No. 290,473, dated December 18, 1883. application filed May 19, 1883. (No model.)

To all whom it may concern:

Be it known that I, DAVID BENSHAW, of Braintree, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Utilizing the EX- haust of Engines; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art. to which it appertains to make and use the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, which form part of this specification.

This invention has for its object the utilization of the exhaust of engines; and it con sists in the process of taking direct from the engine its exhaust and first passing it through a superheater, where a high temperature is imparted to it, and then bringing it in contact with water from the boiler in an injector, the difference in the temperature of the superheated exhaust and that of the boiler-water being sufficient to cool the exhaust or produce a partial vacuum, by which momentum and velocity are added to the said superheated exhaust-steam, and thus it passes into the boiler, from which it was taken, upon the principle of the injector.

Referring to the accompanying drawing,

which shows a side elevation of the apparatus,

A is the boiler and. B the engine.

0 represents the superheater, and D theinj ector, which may be of any approved con struction.

I a is the live-steam pipe to the engine, and b the exhaust-pipe leading to the superheater.

g is a valve on water-pipe f, to control supply of water to injector D.

d is a pipe connecting the injector with the waterspace of the boiler which is provided with the usual check-valve, e; and f is a waterpipe from the boiler communicating with the injector D at a point where the superheated steam and the water passing through said pipe is brought in contact in the usual manner common to injectors, and acting upon the wellknown principle thereof, the difference in temperature between the superheated exhauststeam and the water in the boiler being sufficient to maintain the current from one vessel to another. The connecting-pipes are all provided with suitable valves for controlling communication between the operating parts.

The operation of my invention is as follows: The apparatus being ready for operation, the engine is started and simultaneouslytherewith the injector. The engine is now exhausting into the superheater, where the exhaust-steam receives an increased degree of temperature on its passage to the injector, which being at the opposite end of the superheater, the superheated eXhaust-steam, with a portion of the water from the boiler passing through pipef, enters the induction-orifice of the injector, and with the superheated exhaust-steam establishes a current from the engine through the superheater to the boiler from which it was taken 5 and it will be seen this is effected without the aid of any cooling apparatus or process, and consequently with greater economy of fuel than can be attained where any such apparatus is used to effect a reduction of temperature of the injection-water.

Having described my inventiomwhat I claim as new, and desire to secure by Letters Patent, 1s

1. The process herein described of utilizing the exhaust of engines, by taking it from the engine and first passing it through a superheater, where a high degree of temperature is imparted to it, then conducting it to aninj ector, in which it is brought in contact with water direct from the boiler, but whose temperature is lower than the superheated exhauststeam, thereby causing the said steam to flow toward and into the boiler on the principle of the injector.

2. The combination in an apparatus for returning the exhaust of an engine into the boiler from which it came, consisting of the eX- haust-pipe, a superheater, an injector, aboiler, and the pipe for conveying water from the boiler to the injector, substantially as described. I

In testimony that I claim the foregoing as my own Iaffix my signature in presence of two witnesses.

DAVID RENSEAYV.

Witnesses EDWIN W. BROWN, WM. S. BELLows. 

